4X框架木箱结构内力计算方法研究

目的 以重型包装运输用木质框架结构为研究对象，解决木质框架结构内力求解困难的问题。方法 利用解析法，以4X框架结构为例，分别以经验简化静定桁架与无简化超静定桁架进行求解;基于ANSYS软件建立经验简化静定桁架、无简化超静定桁架、梁模型、梁杆组合模型及实体模型，并进行对比分析。结果 有限元求解结果与解析法结果具有高度的一致性;经验简化静定桁架的最大轴力超过无简化超静定桁架的最大轴力15%;梁模型、梁杆组合模型及实体模型的计算结果与无简化超静定桁架的计算结果一致。结论 经验法对框架结构的简化往往会导致比较大的误差，可能导致过包装设计或欠包装设计。梁杆组合模型和实体模型建模过程比较复杂，选用梁单元对木箱用框架结构进行数值计算分析，不仅计算精度高，分析处理快捷，而且对复杂工况具有较好的适应性。

Internal Force Calculation Method of Wooden Box Structure with 4X Frame

The work aims to propose a solution method of the internal force of the wooden frame structure by taking the wooden frame structure for heavy-duty packaging and transportation as the research object. With 4X frame structure as an example, the empirical simplified statically determinate truss and non-simplified statically indeterminate truss were theoretically solved by analytical method. Based on ANSYS software, empirical simplified statically determinate truss, non-simplified statically indeterminate truss, beam model, beam and rod combination model and solid model were established respectively, and comparative analysis was carried out. The results of finite element analysis were highly consistent with those of analytical method. The maximum axial force of empirically simplified statically determinate truss exceeded the maximum axial force of non-simplified statically indeterminate truss by 15%. The calculation results of beam model, beam and rod combination model and solid model were highly consistent with those of the non-simplified statically indeterminate truss. The simplification of frame structure by empirical method often leads to large errors, resulting in over packaging design or under packaging design. The modeling process of beam and rod combination model and solid model is relatively complex. The beam element is selected for numerical calculation and analysis of the frame structure for wooden box, which not only has high calculation accuracy and fast analysis processing, but also has good adaptability to complex working conditions.